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Article Dans Une Revue Journal of Chemical Physics Année : 2011

Scaling of the viscosity of the Lennard-Jones chain fluid model, argon, and some normal alkanes

Résumé

In this work, we have tested the efficiency of two scaling approaches aiming at relating shear viscosity to a single thermodynamic quantity in dense fluids, namely the excess entropy and the thermodynamic scaling methods. Using accurate databases, we have applied these approaches first to a model fluid, the flexible Lennard-Jones chain fluid (from the monomer to the hexadecamer), then to real fluids, such as argon and normal alkanes. To enlarge noticeably the range of thermodynamics conditions for which these scaling methods are applicable, we have shown that the use of the residual viscosity instead of the total viscosity is preferable in the scaling procedures. It has been found that both approaches, using the adequate scaling, are suitable for the Lennard-Jones chain fluid model for a wide range of thermodynamic conditions whatever the chain length when scaling law exponents and prefactors are adjusted for each chain length. Furthermore, these results were found to be well respected by the corresponding real fluids.
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Dates et versions

hal-00647432 , version 1 (02-12-2011)

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Guillaume Galliero, Christian Boned, Josefa Fernandez. Scaling of the viscosity of the Lennard-Jones chain fluid model, argon, and some normal alkanes. Journal of Chemical Physics, 2011, 134, pp.064505. ⟨10.1063/1.3553262⟩. ⟨hal-00647432⟩

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